Respiration

Question 0

Alveoli

Answer 0

Gas exchange occurs

Question 1

Larynx

Answer 1

Pathway for air

Question 2

Surfactant

Answer 2

Coats alveolus, lowers surface tension, prevents the alveolus from collapsing itself

Question 3

Passageway through which air travels during inhalation

Answer 3

Pharynx -> larynx -> trachea -> bronchi -> alveoli

Question 4

Inhalation

Answer 4

External intercostal muscles expands thoracic cavity, as cavity enlarges the diaphragm flattens down, intrapleural volume increases and intrapleural pressure decreases. Negative pressure breathing

Question 5

Negative pressure breathing

Answer 5

Driving force is the lower (relatively negative) pressure in the intrapleural space compared with the lungs (alveoli)

Question 6

Exhalation

Answer 6

Not active, diaphragm and external intercostals relax, chest cavity decreases. Pressure in intrapleural space goes up. During highly active tasks speed up using internal intercostal muscles

Question 7

Internal intercostal muscles

Answer 7

Oppose the externals and pull the rib cage down actively decreasing the volume of the thoracic cavity

Question 8

Ventilation is regulated by

Answer 8

Neurons in the medulla oblongata